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Net Loss per Share Attributable to Common Stockholders (Tables)
 6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Schedule of Computation of Basic and Diluted Net Income (Loss) Per Share Attributable to Common Stockholders
The following table sets forth the computation of the Company’s basic and diluted net loss per share attributable to common stockholders for the three and six months ended June 30, 2015 and 2014 (in thousands, except for share and per share amounts):
 
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2015
 
2014
 
2015
 
2014
Net loss attributable to common stockholders, basic
$
(16,805
)
 
$
(13,302
)
 
$
(32,207
)
 
$
(34,728
)
Net loss attributable to common stockholders, diluted
$
(16,805
)
 
$
(13,302
)
 
$
(32,207
)
 
$
(34,728
)
Net loss per share attributable to common stockholders
 
 
 
 
 
 
 
Basic
$
(0.71
)
 
$
(0.69
)
 
$
(1.37
)
 
$
(2.26
)
Diluted
$
(0.71
)
 
$
(0.69
)
 
$
(1.37
)
 
$
(2.26
)
Weighted-average shares used in computing net loss per share attributable to common stockholders:
 
 
 
 
 
 
 
Basic
23,584,910

 
19,380,934

 
23,560,133

 
15,361,215

Diluted
23,584,910

 
19,380,934

 
23,560,133

 
15,361,215
Summary of Common Stock Equivalents Excluded from Computation of Diluted Net Income (Loss) Per Share
The following common stock equivalents were excluded from the computation of diluted net loss per share for the periods presented because including them would have been antidilutive: 
 
As of June 30
 
2015
 
2014
Stock options
2,347,195

 
1,890,019

Common stock warrants
198,662

 
153,909

Unvested restricted stock awards
316,763

 
205,050